This work is presenting some forecasts of key developments aggregate of public pension system under transition of the Romanian economy from the status of "in transition" to the market economy - necessity, implementation and immediate effects. In the same time, is presenting theoretical-methodological bases of the macroeconomic forecasting model, the labour market and population - MITGEM, the impact of EU integration on macro-economic developments of the main variables influencing the profitability of pension funds ; alternative forecast scenarios - as the main way of operating the MITGEM...